PWG3/vertexingHF/AliCFVertexingHFCascade.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2011, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  13  * provided "as is" without express or implied warranty.                  *
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  15
  16 //-----------------------------------------------------------------------
  17 // Class for HF corrections as a function of many variables and steps
  18 // For D* and other cascades
  19 //
  20 // Author : A.Grelli a.grelli@uu.nl  UTECHT
  21 //-----------------------------------------------------------------------
  22
  23 #include "AliAODRecoDecayHF2Prong.h"
  24 #include "AliAODMCParticle.h"
  25 #include "AliAODEvent.h"
  26 #include "TClonesArray.h"
  27 #include "AliCFVertexingHF.h"
  28 #include "AliESDtrack.h"
  29 #include "TDatabasePDG.h"
  30 #include "AliAODRecoCascadeHF.h"
  31 #include "AliCFVertexingHFCascade.h"
  32 #include "AliCFContainer.h"
  33
  34 ClassImp(AliCFVertexingHFCascade)
  35
  36
  37 //_________________________________________
  38   AliCFVertexingHFCascade::AliCFVertexingHFCascade(TClonesArray *mcArray, UShort_t originDselection):
  39   AliCFVertexingHF(mcArray, originDselection)
  40 {
  41   // standard constructor
  42
  43   SetNProngs(3);
  44   fPtAccCut=new Float_t[fProngs];
  45   fEtaAccCut=new Float_t[fProngs];
  46   // element 0 in the cut arrays corresponds to the soft pion!!!!!!!! Careful when setting the values...
  47   fPtAccCut[0]=0.;
  48   fEtaAccCut[0]=0.;
  49   for(Int_t iP=1; iP<fProngs; iP++){
  50           fPtAccCut[iP]=0.1;
  51           fEtaAccCut[iP]=0.9;
  52   }
  53
  54 }
  55
  56
  57 //_____________________________________
  58 AliCFVertexingHFCascade& AliCFVertexingHFCascade::operator=(const AliCFVertexingHFCascade& c)
  59 {
  60   // operator =
  61
  62   if  (this != &c) {
  63
  64     AliCFVertexingHF::operator=(c);
  65
  66   }
  67   return *this;
  68 }
  69
  70 //__________________________________________
  71 Bool_t AliCFVertexingHFCascade::SetRecoCandidateParam(AliAODRecoDecayHF *recoCand)
  72 {
  73   // set the AliAODRecoDecay candidate
  74
  75   Bool_t bSignAssoc = kFALSE;
  76
  77   fRecoCandidate = recoCand;
  78   AliAODRecoCascadeHF* dstarD0pi = (AliAODRecoCascadeHF*)recoCand;
  79
  80   if (!fRecoCandidate) {
  81     AliError("fRecoCandidate not found, problem in assignement\n");
  82     return bSignAssoc;
  83   }
  84
  85   if ( fRecoCandidate->GetPrimaryVtx()) AliDebug(3,"fReco Candidate has a pointer to PrimVtx\n");
  86   //if (recoCand->GetPrimaryVtx()) printf("Reco Cand has a pointer to PrimVtx\n");
  87
  88   //Int_t pdgCand = 413;
  89
  90   Int_t pdgDgDStartoD0pi[2]={421,211};
  91   Int_t pdgDgD0toKpi[2]={321,211};
  92
  93   Int_t nentries = fmcArray->GetEntriesFast();
  94
  95   AliDebug(3,Form("nentries = %d\n", nentries));
  96
  97   Int_t mcLabel =  dstarD0pi->MatchToMC(413,421,pdgDgDStartoD0pi,pdgDgD0toKpi,fmcArray);
  98
  99   if (mcLabel < 0) return bSignAssoc;
 100   SetMCLabel(mcLabel);
 101   fmcPartCandidate = dynamic_cast<AliAODMCParticle*>(fmcArray->At(fmcLabel));
 102
 103   if (!fmcPartCandidate){
 104     AliDebug(3,"No part candidate");
 105     return bSignAssoc;
 106   }
 107
 108   bSignAssoc = kTRUE;
 109   return bSignAssoc;
 110 }
 111
 112 //______________________________________________
 113 Bool_t AliCFVertexingHFCascade::GetGeneratedValuesFromMCParticle(Double_t* vectorMC)
 114 {
 115   //
 116   // collecting all the necessary info (pt, y, cosThetaStar, ptPi, ptKa, cT) from MC particle
 117   //
 118
 119         Bool_t bGenValues = kFALSE;
 120
 121
 122         Int_t daughter0ds = fmcPartCandidate->GetDaughter(0);
 123         Int_t daughter1ds = fmcPartCandidate->GetDaughter(1);
 124
 125         //the D0
 126         AliAODMCParticle* mcPartDaughterD0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0ds));
 127         AliAODMCParticle* mcPartDaughterPis = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1ds));
 128
 129         Double_t vtx1[3] = {0,0,0};   // primary vertex
 130         Double_t vtx2daughter0[3] = {0,0,0};   // secondary vertex from daughter 0
 131         Double_t vtx2daughter1[3] = {0,0,0};   // secondary vertex from daughter 1
 132         fmcPartCandidate->XvYvZv(vtx1);  // cm
 133
 134         //D0 daughters
 135         Int_t daughter0 = mcPartDaughterD0->GetDaughter(0);
 136         Int_t daughter1 = mcPartDaughterD0->GetDaughter(1);
 137
 138         AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0)); //D0
 139         AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1)); //pis
 140
 141         // getting vertex from daughters
 142         mcPartDaughter0->XvYvZv(vtx2daughter0);  // cm
 143         mcPartDaughter1->XvYvZv(vtx2daughter1);  //cm
 144         if (TMath::Abs(vtx2daughter0[0] - vtx2daughter1[0])>1E-5 || TMath::Abs(vtx2daughter0[1]- vtx2daughter1[1])>1E-5 || TMath::Abs(vtx2daughter0[2] - vtx2daughter1[2])>1E-5) {
 145           AliError("Daughters have different secondary vertex, skipping the track");
 146           return bGenValues;
 147         }
 148
 149         Int_t nprongs = 2;
 150         Short_t charge = 0;
 151         // always instantiate the AliAODRecoDecay with the positive daughter first, the negative second
 152         AliAODMCParticle* positiveDaugh = mcPartDaughter0;
 153         AliAODMCParticle* negativeDaugh = mcPartDaughter1;
 154         if (mcPartDaughter0->GetPdgCode()<0 && mcPartDaughter1->GetPdgCode()>0){
 155                 // inverting in case the positive daughter is the second one
 156                 positiveDaugh = mcPartDaughter1;
 157                 negativeDaugh = mcPartDaughter0;
 158         }
 159         // getting the momentum from the daughters
 160         Double_t px[2] = {positiveDaugh->Px(), negativeDaugh->Px()};
 161         Double_t py[2] = {positiveDaugh->Py(), negativeDaugh->Py()};
 162         Double_t pz[2] = {positiveDaugh->Pz(), negativeDaugh->Pz()};
 163
 164         Double_t d0[2] = {0.,0.};
 165
 166         AliAODRecoDecayHF* decay = new AliAODRecoDecayHF(vtx1,vtx2daughter0,nprongs,charge,px,py,pz,d0);
 167
 168         Double_t cosThetaStar = 0.;
 169         Double_t cosThetaStarD0 = 0.;
 170         Double_t cosThetaStarD0bar = 0.;
 171         cosThetaStarD0 = decay->CosThetaStar(1,421,211,321);
 172         cosThetaStarD0bar = decay->CosThetaStar(0,421,321,211);
 173         if (mcPartDaughterD0->GetPdgCode() == 421){  // D0
 174           AliDebug(3, Form("D0, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
 175           cosThetaStar = cosThetaStarD0;
 176         }
 177         else if (mcPartDaughterD0->GetPdgCode() == -421){  // D0bar{
 178           AliDebug(3, Form("D0bar, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
 179           cosThetaStar = cosThetaStarD0bar;
 180         }
 181         else{
 182           AliWarning("There are problems!! particle was expected to be either a D0 or a D0bar, check...");
 183           return vectorMC;
 184         }
 185         if (cosThetaStar < -1 || cosThetaStar > 1) {
 186           AliWarning("Invalid value for cosine Theta star, returning");
 187           return bGenValues;
 188         }
 189
 190         Double_t vectorD0[2] ={0.,0.};
 191
 192         // evaluate the correct cascade
 193         if (!EvaluateIfD0toKpi(mcPartDaughterD0,vectorD0)) {
 194           AliDebug(2, "Error! the D0 MC doesn't have correct daughters!!");
 195           return bGenValues;
 196         }
 197
 198         //ct
 199         Double_t cT = decay->Ct(421);
 200         // get the pT of the daughters
 201         Double_t pTD0 = 0.;
 202         Double_t pTpi = 0.;
 203
 204         if (TMath::Abs(fmcPartCandidate->GetPdgCode()) == 413) {
 205                 pTD0 = mcPartDaughterD0->Pt();
 206                 pTpi = mcPartDaughterPis->Pt();
 207         }
 208
 209
 210         vectorMC[0] = fmcPartCandidate->Pt();
 211         vectorMC[1] = fmcPartCandidate->Y() ;
 212         vectorMC[2] = cosThetaStar ;
 213         vectorMC[3] = vectorD0[0];
 214         vectorMC[4] = vectorD0[1];
 215         vectorMC[5] = cT*1.E4 ;  // in micron
 216         vectorMC[6] = 0.;   // dummy value, meaningless in MC
 217         vectorMC[7] = 0.;   // dummy value, meaningless in MC, in micron
 218         vectorMC[8] = 0.;   // dummy value, meaningless in MC, in micron
 219         vectorMC[9] = -100000.; // dummy value, meaningless in MC, in micron^2
 220         vectorMC[10] = 1.01;    // dummy value, meaningless in MC
 221         vectorMC[11] = fmcPartCandidate->Phi();
 222         vectorMC[12] = fzMCVertex;    // z of reconstructed of primary vertex
 223         vectorMC[13] = fCentValue; // reconstructed centrality
 224
 225         delete decay;
 226         bGenValues = kTRUE;
 227         return bGenValues;
 228 }
 229 //____________________________________________
 230 Bool_t AliCFVertexingHFCascade::GetRecoValuesFromCandidate(Double_t *vectorReco) const
 231 {
 232   // read the variables for the container
 233
 234   Bool_t bFillRecoValues=kFALSE;
 235
 236   //Get the D* and the D0 from D*
 237   AliAODRecoCascadeHF* dstarD0pi = (AliAODRecoCascadeHF*)fRecoCandidate;
 238   AliAODRecoDecayHF2Prong* d0toKpi = (AliAODRecoDecayHF2Prong*)dstarD0pi->Get2Prong();
 239
 240
 241   if (dstarD0pi->GetPrimaryVtx())printf("dstarD0pi has primary vtx\n");
 242   if (fRecoCandidate->GetPrimaryVtx())printf("fRecoCandidateDstar has primary vtx\n");
 243
 244   Double_t pt =  dstarD0pi->Pt();
 245   Double_t rapidity =  dstarD0pi->YDstar();
 246   Double_t invMass=0.;
 247   Double_t cosThetaStar = 9999.;
 248   Double_t pTpi = 0.;
 249   Double_t pTK = 0.;
 250   Double_t dca = d0toKpi->GetDCA();
 251   Double_t d0pi = 0.;
 252   Double_t d0K = 0.;
 253   Double_t d0xd0 = d0toKpi->Prodd0d0();
 254   Double_t cosPointingAngle = d0toKpi->CosPointingAngle();
 255   Double_t phi = dstarD0pi->Phi();
 256
 257   Int_t pdgCode = fmcPartCandidate->GetPdgCode();
 258
 259   if (pdgCode > 0){
 260     cosThetaStar = d0toKpi->CosThetaStarD0();
 261     pTpi = d0toKpi->PtProng(0);
 262     pTK = d0toKpi->PtProng(1);
 263     d0pi = d0toKpi->Getd0Prong(0);
 264     d0K = d0toKpi->Getd0Prong(1);
 265     invMass=d0toKpi->InvMassD0();
 266   }
 267   else {
 268     cosThetaStar = d0toKpi->CosThetaStarD0bar();
 269     pTpi = d0toKpi->PtProng(1);
 270     pTK = d0toKpi->PtProng(0);
 271     d0pi = d0toKpi->Getd0Prong(1);
 272     d0K = d0toKpi->Getd0Prong(0);
 273     invMass= d0toKpi->InvMassD0bar();
 274   }
 275
 276   Double_t cT = d0toKpi->CtD0();
 277
 278   vectorReco[0] = pt;
 279   vectorReco[1] = rapidity;
 280   vectorReco[2] = cosThetaStar;
 281   vectorReco[3] = pTpi;
 282   vectorReco[4] = pTK;
 283   vectorReco[5] = cT*1.E4;  // in micron
 284   vectorReco[6] = dca*1.E4;  // in micron
 285   vectorReco[7] = d0pi*1.E4;  // in micron
 286   vectorReco[8] = d0K*1.E4;  // in micron
 287   vectorReco[9] = d0xd0*1.E8;  // in micron^2
 288   vectorReco[10] = cosPointingAngle;  // in micron
 289   vectorReco[11] = phi;
 290   vectorReco[12] = fzPrimVertex;    // z of reconstructed of primary vertex
 291   vectorReco[13] = fCentValue;
 292
 293   bFillRecoValues = kTRUE;
 294
 295   return bFillRecoValues;
 296 }
 297
 298
 299 //_____________________________________________________________
 300 Bool_t AliCFVertexingHFCascade::CheckMCChannelDecay() const
 301 {
 302   // check the required decay channel
 303
 304   Bool_t checkCD = kFALSE;
 305
 306
 307   Int_t daughter0 = fmcPartCandidate->GetDaughter(0);
 308   Int_t daughter1 = fmcPartCandidate->GetDaughter(1);
 309   AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0));
 310   AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1));
 311
 312   if (!mcPartDaughter0 || !mcPartDaughter1) {
 313     AliDebug (2,"Problems in the MC Daughters\n");
 314     return checkCD;
 315   }
 316
 317   if (!(TMath::Abs(mcPartDaughter0->GetPdgCode())==421 &&
 318         TMath::Abs(mcPartDaughter1->GetPdgCode())==211) &&
 319       !(TMath::Abs(mcPartDaughter0->GetPdgCode())==211 &&
 320         TMath::Abs(mcPartDaughter1->GetPdgCode())==421)) {
 321     AliDebug(2, "The D0 MC doesn't come from a Kpi decay, skipping!!");
 322     return checkCD;
 323   }
 324
 325   Double_t vectorD0[2] ={0.,0.};
 326
 327   // D* is a cascade ...evaluate the correct cascade
 328   if (!EvaluateIfD0toKpi(mcPartDaughter0,vectorD0)) {
 329     AliDebug(2, "Error! the D0 MC doesn't have correct daughters!!");
 330     return checkCD;
 331   }
 332
 333   checkCD = kTRUE;
 334   return checkCD;
 335
 336 }
 337
 338 //__________________________________________
 339 Bool_t AliCFVertexingHFCascade::EvaluateIfD0toKpi(AliAODMCParticle* neutralDaugh, Double_t* vectorD0)const
 340 {
 341   //
 342   // chack wether D0 is decaing into kpi
 343   //
 344
 345   Bool_t isHadronic = kFALSE;
 346
 347   Int_t daughterD00 = neutralDaugh->GetDaughter(0);
 348   Int_t daughterD01 = neutralDaugh->GetDaughter(1);
 349
 350   AliDebug(2, Form("daughter0 = %d and daughter1 = %d",daughterD00,daughterD01));
 351   if (daughterD00 == 0 || daughterD01 == 0) {
 352     AliDebug(2, "Error! the D0 MC doesn't have correct daughters!!");
 353     return isHadronic;
 354   }
 355
 356   if (TMath::Abs(daughterD01 - daughterD00) != 1) { // should be everytime true - see PDGdatabooklet
 357     AliDebug(2, "The D0 MC doesn't come from a 2-prong decay, skipping!!");
 358     return isHadronic;
 359   }
 360
 361   AliAODMCParticle* mcPartDaughterD00 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughterD00));
 362   AliAODMCParticle* mcPartDaughterD01 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughterD01));
 363   if (!mcPartDaughterD00 || !mcPartDaughterD01) {
 364     AliWarning("D0 MC analysis: At least one Daughter Particle not found in tree, skipping");
 365     return isHadronic;
 366   }
 367
 368   if (!(TMath::Abs(mcPartDaughterD00->GetPdgCode())==321 &&
 369         TMath::Abs(mcPartDaughterD01->GetPdgCode())==211) &&
 370       !(TMath::Abs(mcPartDaughterD00->GetPdgCode())==211 &&
 371         TMath::Abs(mcPartDaughterD01->GetPdgCode())==321)) {
 372     AliDebug(2, "The D0 MC doesn't come from a Kpi decay, skipping!!");
 373     return isHadronic;
 374   }
 375
 376   Double_t pTD0pi = 0;
 377   Double_t pTD0K = 0;
 378
 379
 380   if (TMath::Abs(mcPartDaughterD00->GetPdgCode()) == 211) {
 381     pTD0pi = mcPartDaughterD00->Pt();
 382     pTD0K = mcPartDaughterD01->Pt();
 383   }
 384   else {
 385     pTD0pi = mcPartDaughterD01->Pt();
 386     pTD0K  = mcPartDaughterD00->Pt();
 387   }
 388
 389   isHadronic = kTRUE;
 390
 391   vectorD0[0] = pTD0pi;
 392   vectorD0[1] = pTD0K;
 393
 394   return isHadronic;
 395
 396 }
 397
 398 //___________________________________________________________
 399
 400 void AliCFVertexingHFCascade::SetPtAccCut(Float_t* ptAccCut)
 401 {
 402         //
 403         // setting the pt cut to be used in the Acceptance steps (MC+Reco)
 404         //
 405
 406         AliInfo("The 3rd element of the pt cut array will correspond to the cut applied to the soft pion - please check that it is correct");
 407         if (fProngs>0){
 408                 for (Int_t iP=0; iP<fProngs; iP++){
 409                         fPtAccCut[iP]=ptAccCut[iP];
 410                 }
 411         }
 412         return;
 413 }
 414
 415
 416
 417 //___________________________________________________________
 418
 419 void AliCFVertexingHFCascade::SetEtaAccCut(Float_t* etaAccCut)
 420 {
 421         //
 422         // setting the eta cut to be used in the Acceptance steps (MC+Reco)
 423         //
 424
 425         AliInfo("The 3rd element of the eta cut array will correspond to the cut applied to the soft pion - please check that it is correct");
 426         if (fProngs>0){
 427                 for (Int_t iP=0; iP<fProngs; iP++){
 428                         fEtaAccCut[iP]=etaAccCut[iP];
 429                 }
 430         }
 431         return;
 432 }
 433 //___________________________________________________________
 434
 435 void AliCFVertexingHFCascade::SetAccCut(Float_t* ptAccCut, Float_t* etaAccCut)
 436 {
 437         //
 438         // setting the pt and eta cut to be used in the Acceptance steps (MC+Reco)
 439         //
 440
 441         AliInfo("The 3rd element of the pt and cut array will correspond to the cut applied to the soft pion - please check that they are correct");
 442         if (fProngs>0){
 443                 for (Int_t iP=0; iP<fProngs; iP++){
 444                         fPtAccCut[iP]=ptAccCut[iP];
 445                         fEtaAccCut[iP]=etaAccCut[iP];
 446                 }
 447         }
 448         return;
 449 }
 450
 451 //___________________________________________________________
 452
 453 void AliCFVertexingHFCascade::SetAccCut()
 454 {
 455         //
 456         // setting the pt and eta cut to be used in the Acceptance steps (MC+Reco)
 457         //
 458
 459         AliAODMCParticle* mcPartDaughter = dynamic_cast<AliAODMCParticle*>(fmcArray->At(2)); // should be the soft pion...
 460         if (TMath::Abs(fLabelArray[0]-fLabelArray[1] != 1) || TMath::Abs(fLabelArray[1]-fLabelArray[2] == 1) || TMath::Abs(fLabelArray[0]-fLabelArray[2] == 1) || TMath::Abs(mcPartDaughter->GetPdgCode())){
 461                 AliFatal("Apparently the soft pion is not in the third position, causing a crash!!");
 462         }
 463         if (fProngs>0){
 464                 for (Int_t iP=0; iP<fProngs-1; iP++){
 465                         fPtAccCut[iP]=0.1;
 466                         fEtaAccCut[iP]=0.9;
 467                 }
 468                 fPtAccCut[3]=0.;  // soft pion
 469                 fEtaAccCut[3]=0.9;  // soft pion
 470         }
 471         return;
 472 }
 473
 474
 475